As record numbers demonstrate in the streets of Hong Kong to protest a proposed extradition law and the mainland Chinese government, a Christian song penned in 1974 has become an "unofficial anthem." Christian groups in the autonomous territory in southeastern China of approximately 7.4 million people — a former British colony — have been singing "Sing Hallelujah To The Lord" by Linda Stassen-Benjamin while protesting and marching in the streets. The song, which is catchy and simple in melody, is popular around the world and has been translated into many languages. The demonstrators have also been protesting against police brutality....